2020-2022 Chrysler Pacifica Rear HVAC Module: Fixing No Air, Wrong Temps & Control Issues
This guide covers the diagnosis and replacement of the rear passenger climate control module, a common source of HVAC problems in the 2020-2022 Chrysler Pacifica.
- This module controls the REAR passenger climate system and is NOT the 'Auxiliary Hybrid Control Module' from PHEV models.
- Failure leads to unresponsive rear controls, incorrect temperatures, or no airflow from rear vents.
- This module is considered PLUG-AND-PLAY and does NOT require dealer programming, making a used OEM part an excellent value.
- There are two main part number series; you must match your original part number or a verified supersession to ensure compatibility with your vehicle's options.
Understanding the Rear HVAC Control Module in Your Pacifica
If your 2020-2022 Chrysler Pacifica is experiencing issues with the rear climate control—like no airflow, incorrect temperatures, or unresponsive controls—the rear HVAC (Heating, Ventilation, and Air Conditioning) control module is a likely culprit. This electronic unit is responsible for managing all rear cabin climate functions. It's important to distinguish this part from other modules in the vehicle, as it serves a very specific purpose.
Important Clarification: This article is about the Rear Passenger HVAC Control Module. It is NOT the 'Auxiliary Hybrid Control Processor' (AHCP) or 'Power Inverter Module' (PIM) found in Pacifica Hybrid (PHEV) models. The AHCP is part of the high-voltage battery system and can cause different issues, like a check engine light (codes P0E15, P0A78-00) and poor overall cabin heating. This guide focuses only on the module for rear passenger comfort.
Symptoms of a Failing Rear HVAC Control Module
When this module begins to fail, the symptoms are usually confined to the rear seating area. You may notice one or more of the following issues:
- Unresponsive Rear Controls: The buttons or knobs for the rear climate system do not respond, or work intermittently.
- Incorrect Air Temperature: The system blows warm air when set to cool, or cold air when set to heat. This happens when the module fails to command the temperature blend door correctly.
- No Airflow from Rear Vents: The rear blower fan does not turn on at any speed, even though you can hear the front fans working. 🎬 Watch this detailed guide to replacing the rear blower motor
- Fan Stuck on One Speed: The rear fan may be stuck on high, low, or another speed and will not adjust.
- Air Comes from Wrong Vents: You are unable to change the airflow between the floor, mid-level, or ceiling vents in the rear.
- "Climate Control Off" Message: In some cases, a complete failure can cause a loss of communication. This may display a "Climate Control Off" message on the Uconnect screen and make all HVAC controls unresponsive. This can sometimes be triggered by a battery change or jump-start. A diagnostic scan may show code U0164 - Lost Communication with HVAC Module.
Pro Tip: If your entire climate control system becomes unresponsive after a battery replacement, try a hard reset. Disconnect the positive cables from both the main and auxiliary batteries for about 10 minutes. Reconnecting them can sometimes restore communication with the HVAC module and fix the issue without replacing any parts.
Known Issues, TSBs, and Recalls
As of mid-2026, there are no specific Technical Service Bulletins (TSBs) or safety recalls issued by Chrysler or the NHTSA for the rear passenger HVAC control module on 2020-2022 Pacifica models.
While TSBs like 08-042-22 and 08-089-20 exist for the "Auxiliary Hybrid Control Processor," these apply only to the hybrid powertrain's thermal management system and are unrelated to the passenger comfort module discussed here. Most rear HVAC problems reported by owners are related to the symptoms listed above or other general system issues like low refrigerant, which can affect rear cooling first.
Buying a Used HVAC Auxiliary Heater Control Module
A used OEM module is an excellent, cost-effective solution for this repair, especially since programming is generally not required. Here’s what to look for when buying a recycled part:
- Match the Part Number Exactly: Chrysler uses several different modules that look identical but have different internal software based on the vehicle's trim and options (e.g., AWD, Red S, 35th Anniversary). The safest way to ensure compatibility is to match the part number from your original module. The part number is printed on the unit's label.
- Understand Part Number Supersessions: It's common for manufacturers to update parts. For example, part number 68373079AB was replaced by 68373079AC, and then 68373079AD. Any of these in the same chain are typically interchangeable. The same applies to the 68467207AB and 68467207AC series. Always verify with the seller.
- Physical Inspection: When you receive the part, inspect the housing for any cracks or signs of water damage. Check that all connector pins are straight and free of corrosion.
- Why Used OEM is a Good Choice: For an electronic module like this that doesn't typically require programming, a used OEM part offers the same fit and function as a new dealer part at a fraction of the price. Aftermarket options are rare for this specific component, making used OEM the best value.
Programming and Installation
Does this module need to be programmed?
No, programming is generally not required. Extensive research of technical documents and owner forums shows no indication that this specific rear HVAC module needs to be flashed or programmed by a dealer. It should be a plug-and-play replacement. This lack of a programming requirement makes installing a used module a straightforward and cost-effective repair for both DIYers and professional shops.
Replacement Procedure
The rear HVAC control module is located in the rear of the vehicle, behind the interior trim panel on the passenger side, near the rear HVAC unit. While not technically difficult, replacement requires careful removal of interior panels to avoid breaking clips.
- Disconnect the vehicle's battery.
- Gain access to the rear passenger-side quarter panel area. This will involve removing cargo area trim and the main side panel.
- Locate the module mounted to the HVAC case.
- Disconnect the electrical connectors. These often have a small locking tab that must be depressed.
- Unscrew or unclip the module from its mounting bracket. 🎬 See how to remove Chrysler Pacifica climate control panels
- Install the new module, reconnect the electrical connectors, and reassemble the interior trim.
- Reconnect the battery and test the rear HVAC system thoroughly.
Cost Breakdown
The cost for this repair can vary significantly depending on the part source and labor rates.
| Item | Estimated Cost | Notes |
|---|---|---|
| New OEM Part | $65 - $190 | Price varies by part number. For example, 68467207AC is around $65, while 68373079AC is closer to $130. |
| Used OEM Part | $40 - $100 | A common price range on sites like eBay, offering significant savings. |
| Shop Labor | $180 - $360 | Estimated 1.5 to 2.5 hours of labor to remove trim, replace the module, and reassemble. |
| Total DIY Repair (Used Part) | $40 - $100 | Requires only the cost of the part. |
| Total Shop Repair (Used Part) | $220 - $460 | Combines the cost of a used part and professional installation. |
Frequently Asked Questions (FAQ)
Does the 2020-2022 Pacifica rear HVAC module need to be programmed by a dealer?
No, based on available data, this module does not require programming. It is considered a plug-and-play component, making a used module a viable and easy-to-install option.
Is the rear HVAC module the same as the Auxiliary Hybrid Control Module?
No, they are completely different parts. The rear HVAC module controls passenger climate in the back seats. The Auxiliary Hybrid Control Processor (AHCP) is found only in hybrid models and helps manage the high-voltage battery's temperature. A failing AHCP can cause a check engine light and poor cabin heat, but it is not related to rear fan or mode door issues.
Why is my Pacifica's rear AC blowing warm air but the front is cold?
This can be caused by several issues. It could be a failing rear HVAC control module that isn't commanding the temperature blend door correctly. However, it can also be a symptom of low refrigerant in the system; since the rear HVAC unit is the last part of the system to receive refrigerant, it's often the first to lose cooling performance. A faulty rear blend door actuator could also be the cause.
Can I replace the rear HVAC control module myself?
Yes, this is a feasible DIY job for someone comfortable with removing interior trim panels. The part itself is simple to swap with just a few connectors and mounting screws. The main challenge is accessing it behind the passenger-side rear quarter panel without damaging any plastic clips or trim pieces.
Helpful Videos
Technical Specifications
OEM Part Numbers: 68373079AB 68373079AC 68373079AD 68467207AB 68467207AC
Controls rear HVAC blower, temperature blend door, and mode door actuators. Communicates with the vehicle's main body control module and Uconnect system.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Chrysler Pacifica:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Understanding the Rear HVAC Control Module in Your Pacifica
- Symptoms of a Failing Rear HVAC Control Module
- Known Issues, TSBs, and Recalls
- Buying a Used HVAC Auxiliary Heater Control Module
- Programming and Installation
- Does this module need to be programmed?
- Replacement Procedure
- Cost Breakdown
- Frequently Asked Questions (FAQ)
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